class A {}; class B {inherit A;}; now works, typechecking improved

Rev: src/compilation.h:1.3
Rev: src/las.c:1.13
Rev: src/pike_types.c:1.13
Rev: src/pike_types.h:1.3
Rev: src/program.c:1.14
Rev: src/program.h:1.8
Rev: src/testsuite.in:1.16
Rev: src/version.c:1.4
Rev: src/version.h:1.2